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If a triangle has a area of 42 cm^2 and a base of 8 cm, what is the height?

show work plsssss

User Pavle
by
7.6k points

2 Answers

13 votes

Answer:

hb=10.5cm

Explanation:

Area of triangle = 1/2(height x base)

The problem states that base is 8 cm greater than the height; therefore, base-8 = height.

A = 1/2(b*h)

42 = 1/2(b*[b-8])

84=(b^2-8b)

rearrange to

b^2 - 8b -84

factor to

(b+8)(b-14)

Therefore, b = -8 cm which makes no sense and

b = +14 cm

and height = 14-8 = 6

Check:

1/2(b*h) = area

1/2(14*6) = 1/2(84)=42

User Jake Brewer
by
7.1k points
3 votes

Answer:

The height would be 10.5 cm